The eight manuscripts 1013, 1012, 1010, 589, 1011, 1015, 1017, and 1018 were copied over a period spanning two centuries. Codices Claustroneoburgensis (CCl.) 1013, 1012 and 1010 are among the oldest surviving sources in the Klosterneuburg library of the sung Office liturgy. CCl. 1013 and 1012 can be paired to create a complete twelfth-century representation of the church year, since 1012 begins at Pentecost and 1013 ends just before. CCl. 589, 1011, 1015, 1017 and 1018 date from over a century later. Of these later manuscripts, three contain the chants of the pars hiemalis (winter) and two the pars aestiva (summer).

Several of the Offices found in these manuscripts but not included in CAO appear in full in Analecta hymnica (AH), as well as in other CANTUS files. The Office for Immaculate Conception appears in AH vol. 5, pp. 47-50; Ursula appears in AH vol. 28, pp. 256-9; and Benedict in AH vol. 25, pp. 145-9.

The differentiae of each mode have been numbered with a two-digit system: an upper-case letter indicating the final pitch of the differentia and a sequentially-ordered numeral. These differentia codes are consistent throughout these eight Klosterneuburg indices.

The eight Klosterneuburg manuscripts are likely from the female side of the double house and reflect the particular liturgical practices of the women of Klosterneuburg, as discussed by Klugseder, Norton, and Carr.